Messages in this thread | | | Date | Thu, 01 Nov 2007 14:28:09 -0700 (PDT) | Subject | Re: [patch 0/7] [RFC] SLUB: Improve allocpercpu to reduce per cpu access overhead | From | David Miller <> |
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From: Christoph Lameter <clameter@sgi.com> Date: Thu, 1 Nov 2007 05:57:12 -0700 (PDT)
> That is basically what IA64 is doing but it not usable because you would > have addresses that mean different things on different cpus. List head > for example require back pointers. If you put a listhead into such a per > cpu area then you may corrupt another cpus per cpu area.
Indeed, but as I pointed out in another mail it actually works if you set some rules:
1) List insert and delete is only allowed on local CPU lists.
2) List traversal is allowed on remote CPU lists.
I bet we could get all of the per-cpu users to abide by this rule if we wanted to.
The remaining issue with accessing per-cpu areas at multiple virtual addresses is D-cache aliasing. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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